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RECONSTRUCTION OF MISSING PACKETS FOR CELP-BASED SPEECH CODERS. Aamir Husain and Vladimir Cuperman School of Engineering Science, Simon Fraser University 1995 IEEE. Hung, Kuo-En NTHU/CS, Visual Communication Lab. Outline. Introduction System Overview Packet Reconstruction model

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reconstruction of missing packets for celp based speech coders

RECONSTRUCTION OF MISSING PACKETS FOR CELP-BASED SPEECH CODERS

Aamir Husain and Vladimir Cuperman

School of Engineering Science, Simon Fraser University

1995 IEEE

Hung, Kuo-En NTHU/CS, Visual Communication Lab.

outline
Outline
  • Introduction
  • System Overview
  • Packet Reconstruction model
  • Spectral extrapolation
  • Simulation results
  • Implementation
introduction
Introduction
  • Jayant – odd-even sample interpolation in PCM and DPCM systems.
  • Goodman – waveform substitution techniques such as pattern matching in PCM systems.
  • Erdol – waveform substitution based on interpolative techniques on short-time energy parameters in PCM systems.
  • Leung – vector linear prediction in voiced frame reconstruction in CELP coders over frame relay networks.
system overview
System Overview
  • Base on
    • LD-CELP 16kb/s standard (G.728)
    • Variable rate CELP coder (VAR-CELP)
  • Frame Classifier
    • voiced, unvoiced, transition, silence
  • Switch three distinct codec configuration
    • 8.0 kb/s for voiced and transition frames
    • 4.3 kb/s for unvoiced frames
    • 667 b/s for silence
implementation
Implementation
  • Pitch Estimation
recovery method
Recovery Method

Frame(n-1)

Frame(n)

simulation result erasure
Simulation Result (erasure)

Erasure Speech (20% lost rate)

result compare

original

erasure

recovery

Result Compare